The Philips InnoSpire Go nebuliser has a built-in rechargeable battery that delivers up to 30 treatments when fully charged. To charge the battery, you need this power supply. You can still use your nebuliser while the battery is charging. This AC power supply is a replacement part. It’s standard included with the InnoSpire Go nebuliser. It works on 100 – 240 V and 50/60 Hz.